Properly frozen and preserved tomatoes that have not expired are not harmful, but improperly preserved frozen tomatoes may cause nausea, vomiting and other symptoms of food poisoning. Tomatoes are not usually kept frozen, but refrigerated or at room temperature. As long as the outer skin is intact, they keep for a longer period of time. If the tomatoes are kept in a good preservation environment and have not deteriorated, their nutritional structure will not change greatly and they are still edible, but their texture has changed significantly and they have lost their original flavor. If the tomato is frozen and preserved and deterioration has occurred, it is not recommended to eat. Otherwise, food poisoning symptoms such as nausea, vomiting, abdominal pain and diarrhea may easily occur. Some moldy tomatoes contain carcinogens. Tomatoes are more nutritious, each 100 grams of tomatoes contain 15 calories, 3.3 grams of carbohydrates, 0.2 grams of fat, 0.9 grams of protein, 1.0 grams of fiber, vitamin A31 micrograms, vitamin C14 milligrams, and 4 milligrams of calcium. Consumed in moderation, they can provide the body with a variety of nutrients to ensure the normal functioning of the body’s functions. It is recommended to consume fresh tomatoes so as to maximize the absorption of the nutrients therein, which is conducive to good health.